1 files changed, 68 insertions, 0 deletions
diff --git a/src/test/ui/traits/negative-impls/negated-auto-traits-error.rs b/src/test/ui/traits/negative-impls/negated-auto-traits-error.rs
new file mode 100644
index 000000000..4bdad5dc5
--- /dev/null
+++ b/src/test/ui/traits/negative-impls/negated-auto-traits-error.rs
@@ -0,0 +1,68 @@
+// The dummy functions are used to avoid adding new cfail files.
+// What happens is that the compiler attempts to squash duplicates and some
+// errors are not reported. This way, we make sure that, for each function, different
+// typeck phases are involved and all errors are reported.
+
+#![feature(negative_impls)]
+
+use std::marker::Send;
+
+struct Outer<T: Send>(T);
+
+struct Outer2<T>(T);
+
+unsafe impl<T: Send> Sync for Outer2<T> {}
+
+fn is_send<T: Send>(_: T) {}
+fn is_sync<T: Sync>(_: T) {}
+
+fn dummy() {
+    struct TestType;
+    impl !Send for TestType {}
+
+    Outer(TestType);
+    //~^ ERROR `dummy::TestType` cannot be sent between threads safely
+    //~| ERROR `dummy::TestType` cannot be sent between threads safely
+}
+
+fn dummy1b() {
+    struct TestType;
+    impl !Send for TestType {}
+
+    is_send(TestType);
+    //~^ ERROR `dummy1b::TestType` cannot be sent between threads safely
+}
+
+fn dummy1c() {
+    struct TestType;
+    impl !Send for TestType {}
+
+    is_send((8, TestType));
+    //~^ ERROR `dummy1c::TestType` cannot be sent between threads safely
+}
+
+fn dummy2() {
+    struct TestType;
+    impl !Send for TestType {}
+
+    is_send(Box::new(TestType));
+    //~^ ERROR `dummy2::TestType` cannot be sent between threads safely
+}
+
+fn dummy3() {
+    struct TestType;
+    impl !Send for TestType {}
+
+    is_send(Box::new(Outer2(TestType)));
+    //~^ ERROR `dummy3::TestType` cannot be sent between threads safely
+}
+
+fn main() {
+    struct TestType;
+    impl !Send for TestType {}
+
+    // This will complain about a missing Send impl because `Sync` is implement *just*
+    // for T that are `Send`. Look at #20366 and #19950
+    is_sync(Outer2(TestType));
+    //~^ ERROR `main::TestType` cannot be sent between threads safely
+}